H.D. Chen
,
Y.W. Wang
,
J. Xue
金属学报(英文版)
A computer simulation technique for ultrasonic propagation is utilized for the simulation of ultrasonic nondestructive testing (NDT). In this paper, one goal of the simulation is to compute ultrasoniceld radiated by arbitrary transducers into pieces under examination. The other simulates a testing experiment. The simulation approach is based on the model for the computation of the ultrasoniceld in isotropic media radiated from actual NDT transducers. After the eld is known, remaining to be modeled is the interaction between this eld and the scatters (defect) and the echo structure. The model of beam-defect interaction is based on the Kirchho's diffraction approximations theory applied to elastodynamics. We assumed that the incident wave fronts on the defect are plane in the case of a focused immersed transducer and material is isotropic and homogeneous. The simulating results demonstrate that the model in ultrasonic NDT of welds is practical in further research and useful in optimizing testing congurations.
关键词:
ultrasonic testing
,
null
,
null
,
null
杨帅
,
彭云
,
张晓牧
,
彭展南
,
田志凌
航空材料学报
doi:10.3969/j.issn.1005-5053.2014.1.003
采用光学显微镜、扫描电镜和能谱分析对马氏体时效钢(C300级)钨极氩弧焊焊缝中偏析的合金元素在不同温度固溶时均匀化情况进行了初步的计算和分析.研究认为C300钨极氩弧焊焊缝中主要偏析合金元素是Ni,Mo,Ti;焊缝经1200℃/1h AC处理可以获得成分均匀的马氏体;成分均匀的焊缝进行480℃/4h AC时效处理将不再产生逆转变奥氏体.
关键词:
马氏体时效钢
,
焊缝
,
偏析
,
均匀化
,
逆转变奥氏体
